exhaust gases

[roddy]

Hi folks

anybody here know about exhaust gases and what the composition of the gases are ?

I was reading recently about the "CO potiometer" on the 1100GS and how this replaces a lambda sensor for the bikes FI system. now being a curious sort I got to wondering whats my bike putting out, so done a quick search on Ebay for CO testers and basically theres the gunson gastester at varing prices, but I have access to CO2 monitoring not CO monitoring so not wishing to spend money for someting I would rarely use.

heres the question, if you are measuring the CO to acheive roughly the lowest reading would this mean that if you measure CO2 it would be nearly the highest reading your lookign for to achieve the 14.7:1 fueling ratio thats meant to be the optimum and if so what would that reading be as a guideline ?

or is my thinking flawed ?

cheers

 

[cookie]

dunno about CO/CO2 but don't buy a gunsons gas analyser, they are bloody useless.

 

[Sea Lion]

I've often wondered about this and more to the point, would it be possible to retro-fit the lambda sensor instead of the CO potentiometer. The fuel injection systen then would adjust it'self? Wouldn't it?

Also, does any one know the CO readings that an 1100 should give. I have thought about bunging my local garage a tenner to use their 'proper' gas analyser.

 

[roddy]

taken from the manual

Engine idle speed 1000 +150 1/min
CO value (without catalytic converter) 1.5 ±0.5 Vol %

HTH

 

[cookie]

i have a recently calibrated gas analyser that could stand being used now & again.

i'd be happy to stick it up anyone's pipe who turns up here

 

[cookie]

taken from the manual

Engine idle speed 1000 +150 1/min
CO value (without catalytic converter) 1.5 ±0.5 Vol %

HTH

can you tell me what the figures are for the 1150? i had it somewhere, but can't seem to find it now
if it's in the manual, can you point me at it too please?

 

[roddy]

Cookie I only have the 1100 manual, downloading the 1150 manual at the mo', so if nobodys posted the answer I'll post it later on it's a bit of a slow connection.

In the 1100 manual it was under the "service data" section

HTH

 

[cookie]

roddy,

i looked in the service data page of the 1150 manual & it's not shown AFAICT. possibly 'cos it can't be adjusted anyway

i have a recently calibrated gas analyser that could stand being used now & again.

i'd be happy to stick it up anyone's pipe who turns up here

um,

hold that offer, just gone to use it & found the the thing's f*cked. bloody snap~on crap

best thing i can say is, i know it's bolloxed. my old gunson would mislead me for hours

 

[roddy]

If I understand the basic of a FI system the lambda sensor detects the O2 content of the exhaust gas and regulates the fueling to get the correct reading so,

if you change the FI control unit or one of it's parameters ie changing the jumper setting in the fuse box so the control unit is using a different FI map or change the exhaust sytem someway, then you are changing the FI/exhaust system so standard setting may not work so it would need to be set up again.

so you could adjust the system so changing the CO content ?

also the CO content (amongst other things) of your fueling system is working correctly and doesn't have leaks in the system.

cheers

 

[pomm001]

If I understand the basic of a FI system the lambda sensor detects the O2 content of the exhaust gas and regulates the fueling to get the correct reading so,

if you change the FI control unit or one of it's parameters ie changing the jumper setting in the fuse box so the control unit is using a different FI map or change the exhaust sytem someway, then you are changing the FI/exhaust system so standard setting may not work so it would need to be set up again.

so you could adjust the system so changing the CO content ?

also the CO content (amongst other things) of your fueling system is working correctly and doesn't have leaks in the system.

cheers

not quite sure what you are trying to achive here roddy
The CO reading is generaly taken at idle, and where a mixture can be adjusted ie early FI units and carbs, this adjusts the idle mixture only.
The 14.7 ratio you metion has a fancy name begining with S i dont remember right now is the optimum and only achieved in a very few conditions.
The CO value of 1.0 to 1.5 % is a typical idle mixture, and in general the older the engine the higher the CO needs to be to get a decent idle, from memeory the old MOT standard was 4%, very rich.
With the FI sytem there are numerous imputs to the ECU to generate the correct fueling, air temp,crank position,engine temp, throttle position etc.
If you want to bullshit the ECU to give you more fuel you can get piggy back' gizmo to tell the ECU that the engine is colder than it is and it will richen the mixure up that way.
As in a previous reply be very carefull of taking CO values with cheap monitors use a professional CALIBRATED machine .
But in general apart from writing your own ignition and fuel map or paying lots of lolly for alternative chips all you could do is to make sure all the setting are to factory spec.Just remember the fuel maps on bikes are very much more 'simple' than that of our 4 wheel friends , and are designed to meet emission regulations first and foremost,not performance
This has probably not helped you one little bit !

 

[roddy]

pomm001

I wasn't really trying to achieve anything, I was answering Cookies statement

"i looked in the service data page of the 1150 manual & it's not shown AFAICT. possibly 'cos it can't be adjusted anyway "

as explained I was under the impression that even though the modern FI systems are closed looped they can be influenced to give high/lower fuel if something has changed.

My original query was as I don't have access to a decent exhaust gas analyser, but I do have access to a gas analyser that measures CO2 so would the thinking that if good combustion happens at low CO levels would good combustion happen at high CO2 levels.
I've done a bit of trawling through google and found an article by Toyota for cars, I'm assuming the basic theory is the same for all engines so my idea to use CO2 instead of CO as a guide was okay.

I was wanting to be able to check all possible things before the bike went onto a dyno to check for power as I have always felt that my 1100GS felt a bit under powered as if something was holding it back and it could achieve better especially when overtaking.

Though this might just be a perception being under powered as this is the first bike I've had that has a fairing of any sort.

cheers